Cat Calorie Calculator
Estimate a cat’s resting calories, daily energy allowance, and food portion.
On this page
CalculatorHow to useFormula & methodWorked exampleA species-appropriate starting estimateAdjust based on the cat, not just the equationFrequently asked questionsRelated calculatorsSourcesHow to use this calculator
- Enter weight and choose the unit.
- Select an adult or growth estimate, or use a custom multiplier supplied for your cat’s feeding plan.
- Enter the food’s energy density in the matching unit to calculate the daily portion and portion per meal.
Formula and method
For the assumptions behind these results, read the explanation below. You can also explore Cat Age and Cat BMI.
A worked example
A 4 kg neutered adult has an estimated RER of 198 kcal/day. A factor of 1.2 gives about 238 kcal/day. At 100 kcal per 100 g, that is about 238 g daily, or 119 g per meal for two meals.
A species-appropriate starting estimate
Resting energy is a baseline for essential body functions. Multipliers provide an initial allowance for a particular life stage and activity pattern, but individual cats can need substantially different amounts. This implementation uses feline adult starting factors rather than copying canine maintenance factors.
Food energy density determines portion size. Canned and dry foods often differ dramatically in calories per gram because of their moisture content. Use the energy value from the exact product label. If mixing foods, allocate calories between them before calculating their separate portions; do not give the full calculated allowance from each food.
Adjust based on the cat, not just the equation
The result does not establish ideal body weight or diagnose obesity. A healthy feeding plan considers body condition, muscle condition, age, and medical history alongside regular weight measurements. Growth estimates in particular need frequent reassessment because a kitten’s weight and needs change quickly.
Calories in treats and other extras contribute to total intake. For a cat needing weight loss, recovery nutrition, pregnancy support, or treatment of illness, ask the veterinary team to set an individualized plan. Sudden food restriction or a prolonged refusal to eat should not be managed by reducing a calculator target alone.
Frequently asked questions
Why is my result different from a dog calorie calculation?
Cats and dogs use different typical maintenance multipliers even though this resting-energy equation is shared.
What if my label gives kcal per can?
Divide the can’s calories by its gram weight, then multiply by 100 to obtain kcal per 100 g.
Is the kitten setting exact for every age?
No. It is a broad starting estimate. Growth stage, body condition, and the food’s suitability for kittens need separate assessment.
Sources and further reading
- Ohio State University Veterinary Medical Center: companion animal nutrition ↗
Documents RER = 70 × kg^0.75, canine life-stage factors, and adjustment to the individual animal. Working-dog presets select values within its 2–5 × RER range.
- MSD Veterinary Manual: Nutritional Requirements of Small Animals ↗
Veterinary reference textbook published by Merck & Co., Inc. Its maintenance-energy table documents the feline 1.2, 1.4, 1.0, and 2.5 multipliers used here; all are starting estimates.
- National Institute of Standards and Technology — SI conversion factors ↗
Reference for physical unit conversions. The calculator converts measurements before applying its formula.
Our explanations are written for BiologyCalc. Read how we build and check our tools. These calculations are educational estimates where the underlying model requires assumptions.